package com.astar.framework.config;

import com.alibaba.druid.spring.boot3.autoconfigure.properties.DruidStatProperties;
import com.alibaba.druid.util.Utils;
import jakarta.servlet.*;
import java.io.IOException;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * druid 配置多数据源
 *
 * @author astar
 */
@Configuration
public class DruidConfig {

  /** 去除监控页面底部的广告 */
  @SuppressWarnings({"rawtypes", "unchecked"})
  @Bean
  @ConditionalOnProperty(
      name = "spring.datasource.druid.statViewServlet.enabled",
      havingValue = "true")
  public FilterRegistrationBean removeDruidFilterRegistrationBean(DruidStatProperties properties) {
    // 获取web监控页面的参数
    DruidStatProperties.StatViewServlet config = properties.getStatViewServlet();
    // 提取common.js的配置路径
    String pattern = config.getUrlPattern() != null ? config.getUrlPattern() : "/druid/*";
    String commonJsPattern = pattern.replaceAll("\\*", "js/common.js");
    final String filePath = "support/http/resources/js/common.js";
    // 创建filter进行过滤
    Filter filter =
        new Filter() {
          @Override
          public void init(jakarta.servlet.FilterConfig filterConfig) throws ServletException {}

          @Override
          public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
              throws IOException, ServletException {
            chain.doFilter(request, response);
            // 重置缓冲区，响应头不会被重置
            response.resetBuffer();
            // 获取common.js
            String text = Utils.readFromResource(filePath);
            // 正则替换banner, 除去底部的广告信息
            text = text.replaceAll("<a.*?banner\"></a><br/>", "");
            text = text.replaceAll("powered.*?shrek.wang</a>", "");
            response.getWriter().write(text);
          }

          @Override
          public void destroy() {}
        };
    FilterRegistrationBean registrationBean = new FilterRegistrationBean();
    registrationBean.setFilter(filter);
    registrationBean.addUrlPatterns(commonJsPattern);
    return registrationBean;
  }
}
